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Internet Explorer automatically creates variables for identified elements and named elements, which has always been a bad feature.
You need to explicitly create those variables for the script to work properly.

Raffles is right, pass the text value 'row1' to the function.

The problem lies in the function itself. After getting the element from the passed identifier, you went on on to use the passed identifier as if it were an element. Confusing, and no wonder you were having such troubles.